Amulet of Abjurative Armour

A spellcaster may expend a spell slot to fill this item with protective qualities. At 1st level, the item creates a shield of 1d4 + spellcasting modifier hit points. Whilst the item has hit points, the wearer has resistance to all damage types except psychic. When the wearer loses hit points, so does the item. When the item hits 0 hit points, it becomes inert until another spell slot is used on it.

At higher levels. For every spell level used over 1st level, the hit points of the item increases by 5.